A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-281-7336
NSN 6135-01-111-1495
NSN 2925-01-118-6125
NSN 6610-00-440-3250
NSN 7035-00-541-8516
NSN 5950-01-415-3741
NSN 6320-01-478-9351
NSN 6620-01-278-6953
NSN 5935-01-309-2369
NSN 6145-00-360-3874
NSN 6145-00-114-0197
NSN 5835-01-116-2369